Prepare your semi to be Ready for the Road Ahead , with the Bendix MV-3 Series 3/8" Push to Connect Type Dash Control Valve that provides enhanced control of its braking system. By utilizing a sophisticated design, this replacement valve helps regulate how much brake pressure is applied to the wheels by controlling the flow of compressed air to various parts of brake system. Prepared with a durable design to withstand extreme pressures and idle operations. FleetPride is your First Click in Heavy Duty .